/* Compute the sum of the squares of a vector of signed shorts * The SSE2 and MMX assist routines both operate on multiples of * 8 words; they differ only in their alignment requirements (8 bytes * for MMX, 16 bytes for SSE2) * Copyright 2004 Phil Karn, KA9Q * May be used under the terms of the GNU Lesser Public License (LGPL) */long long sumsq_sse2_assist(signed short *,int);long long sumsq_sse2(signed short *in,int cnt){  long long sum = 0;  /* Handle stuff before the next 8-byte boundary */  while(((int)in & 15) != 0 && cnt != 0){    sum += (long)in[0] * in[0];    in++;    cnt--;  }  sum += sumsq_sse2_assist(in,cnt);  in += cnt & ~7;  cnt &= 7;  /* Handle up to 7 trailing words */  while(cnt != 0){    sum += (long)in[0] * in[0];    in++;    cnt--;  }  return sum;}